However, I am trying to learn to create a PCB modeling it on a simple evaluation board from the Texas instruments website, so I downloaded the zip file of gerbers they provided... So I have gerber files in these file formats (note the file extensions):pcbname.TOP (top layer), pcbname.BOT (bottom layer), pcbname.TMK (top solder mask), pcbname.BMK (bottom solder mask), pcbname.BRD (board outline), pcbname.TSK (text top layer), pcbname.NCD (NC drill file, plated), pcbname.FAB

Question:Assuming it's even necessary, how can I convert gerber files of the lower file extension formats into gerber files of the upper formats above, so I can send them to the pcb manufacturer?

SOLVED:While the file extensions (as above) are different depending on the program used to create them, the files correspond to each other and contain the exact same information, as far as sending a PCB design out.

In that case, while the rest are fine, there are two mismatches I spotted in the two varieties:pcbname.GTO (silk, top), pcbname.GBO (silk, bottom)VERSUSpcbname.BRD (board outline), pcbname.TSK (text top layer), pcbname.FAB

Any idea how the two silk layers would match to the files in the lower format?one of them I can take a guess: GTO(silk top) = PSK (text top layer)

Most likely the .TSK file and the .GTO file are the same in purpose. Also, it is quite possible the TI files have no silkscreen on the bottom layer hence there is no file provided.

As there is no standard for Gerber file extensions, there is also no standard as to what files are sent to a PCB manufacturer. The TI files, for example, come with a .BRD board outline, but this is not always a requirement and it is a file you don't seem to have from Eagle (though you can easily generate it by modifying the CAM file to generate an output based on the Dimension layer).

Same with the .FAB file...who knows what is in it? Various fabrication information that is optional and could also be communicated with a text file perhaps.

You can view the Gerber files yourself using a previewer such as GC-Prevue, ViewMate, or gerbv (my favorite) under Linux/Mac OS X. Then you can see what is in them and match them up with what you expect.